Question

我的问题是：

学生成绩最高的学生。
学生的注册人主题恶习最高。

存在一个带有属性的表“学生”（reg_id，subject，marks）。

共有8个科目，每个学生全部攻读8个科目。因此，该表包含每个学生8个记录。学生的数量取决于。例如：10名学生，总数为no.of.records = 8 * 10 = 80。

以下是我的疑问。请有人纠正它的错误。谢谢。

1)"select A.reg_id from (select S.reg_id, sum(S.marks) as total from students S group by S.reg_id) as A where A.total=(select max(C.total) from (select S1.reg_id,sum(S1.marks) as total from students S1 group by S1.reg_id) as C);"

2)"select A.reg_id from (select S.reg_id, sum(S.marks) as total from students S group by S.reg_id) as A where A.total=(select max(A.total) from A);"`

错误消息：

ERROR 1064 (HY000) at line 1: You have an error in your SQL syntax.  Check the manual that corresponds to your MySQL server version for the right syntax to use near 'select S.reg_id, sum(S.marks) as total from
students S group by
Student's reg_id who took highest total marks : 
 Students' reg_ids who took highest for subject vice : reg_id subject max(s.marks) id1 Buddhist 99 id1 computer 81 id1 English 95 id5 History 82 id1 Literature 95 id1 Maths 97 id1 Sinhala 85 id9 Social 90

第二个，我得到答案，但没有正确的价值。

Answer 1

你改变如下：

select A.reg_id from (select S.reg_id, sum(S.marks) as total from students S group by S.reg_id) as A where A.total IN (select max(C.total) from (select S1.reg_id,sum(S1.marks) as total from students S1 group by S1.reg_id) as C);

select A.reg_id from (select S.reg_id, sum(S.marks) as total from students S group by S.reg_id) as A where A.total IN (select max(A.total) from A);

Answer 2

你可以试试这个。

      Select reg_id, max (total) as maxtotal from (
        select reg_id, sum(marks) as total from students S    group by reg_id ) t

mysql嵌套查询获取语法错误

2 个答案: